Which of the following is a free-living anaerobic bacterium capable of fixing nitrogen?

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Clostridium sp.

Streptococcus sp.

Azotobacter sp.

Rhizobium sp.

answer is C.

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Detailed Solution

Nitrogen-fixing microorganisms are capable of transforming atmospheric nitrogen into fixed nitrogen. The free-living (non-symbiotic) bacteria include cyanobacteria and some genera such as Azotobacter sp., Clostridium sp., etc.
Clostridium sp. includes the genus of anaerobic, gram-positive bacteria, whereas Azotobacter sp. refers to the genus of aerobic gram-negative nitrogen-fixing bacteria.

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